fix(mine): 修复我的页面背景，添加顶部暖橙色渐变

- 页面背景改为 #F3F3F3
- 顶部添加从 #FFEFDE 到 #F3F3F3 的渐变背景层
- 移除自定义导航栏，使用系统导航栏
- 菜单列表去掉白色卡片包裹，改为透明背景

uniapp/pages/mine/index.vue

@@ -1,11 +1,7 @@
 <template>
   <view class="mine-page">
-    <!-- 自定义导航栏 -->
-    <view class="custom-navbar" :style="navbarStyle">
-      <view class="navbar-content" :style="{ height: navbarHeight + 'px' }">
-        <text class="navbar-title">我的</text>
-      </view>
-    </view>
+    <!-- 顶部渐变背景层 -->
+    <view class="top-gradient"></view>
 
     <!-- 导航栏占位 -->
     <view class="navbar-placeholder" :style="{ height: totalNavbarHeight + 'px' }"></view>
@@ -115,7 +111,7 @@ import { useUserStore } from '@/store/user.js'
 import { useNavbar } from '@/composables/useNavbar.js'
 
 const userStore = useUserStore()
-const { statusBarHeight, navbarHeight, totalNavbarHeight } = useNavbar()
+const { totalNavbarHeight } = useNavbar()
 
 // 退出登录弹窗状态
 const logoutPopupVisible = ref(false)
@@ -131,12 +127,6 @@ const userInfo = computed(() => ({
   avatar: userStore.avatar
 }))
 
-// 导航栏样式
-const navbarStyle = computed(() => ({
-  paddingTop: statusBarHeight.value + 'px',
-  height: totalNavbarHeight.value + 'px'
-}))
-
 /**
  * 点击用户区域
  */
@@ -278,46 +268,40 @@ onMounted(() => {
 
 .mine-page {
   min-height: 100vh;
-  background-color: $bg-color;
+  background-color: #F3F3F3;
+  position: relative;
 }
 
-// 自定义导航栏
-.custom-navbar {
-  position: fixed;
+// 顶部渐变背景
+.top-gradient {
+  position: absolute;
   top: 0;
   left: 0;
   right: 0;
-  background-color: $bg-white;
-  z-index: 999;
-
-  .navbar-content {
-    display: flex;
-    align-items: center;
-    justify-content: center;
-
-    .navbar-title {
-      font-size: 34rpx;
-      font-weight: $font-weight-medium;
-      color: $text-color;
-    }
-  }
+  height: 500rpx;
+  background: linear-gradient(177deg, #FFEFDE 1%, #F3F3F3 28%);
+  z-index: 0;
 }
 
 .navbar-placeholder {
   width: 100%;
+  position: relative;
+  z-index: 1;
 }
 
 // 页面内容
 .page-content {
   padding: $spacing-lg;
   padding-bottom: env(safe-area-inset-bottom);
+  position: relative;
+  z-index: 1;
 }
 
 // 用户信息区域
 .user-section {
   display: flex;
   align-items: center;
-  padding: $spacing-xl $spacing-lg;
+  padding: $spacing-xl 0;
   margin-bottom: $spacing-lg;
 
   .user-avatar {
@@ -325,7 +309,6 @@ onMounted(() => {
     height: 120rpx;
     border-radius: 50%;
     margin-right: $spacing-lg;
-    background-color: $bg-gray;
   }
 
   .user-info {
@@ -354,21 +337,18 @@ onMounted(() => {
 
 // 菜单区域
 .menu-section {
-  margin-bottom: $spacing-lg;
+  margin-bottom: $spacing-xl;
 
   .section-title {
     display: block;
     font-size: $font-size-lg;
     font-weight: $font-weight-bold;
     color: $text-color;
-    padding: 0 $spacing-sm;
     margin-bottom: $spacing-md;
   }
 
   .menu-list {
-    background-color: $bg-white;
-    border-radius: $border-radius-lg;
-    overflow: hidden;
+    background-color: transparent;
   }
 }
 
@@ -376,15 +356,10 @@ onMounted(() => {
 .menu-item {
   display: flex;
   align-items: center;
-  padding: $spacing-lg;
-  border-bottom: 1rpx solid $border-light;
-
-  &:last-child {
-    border-bottom: none;
-  }
+  padding: $spacing-lg 0;
 
   &:active {
-    background-color: $bg-gray;
+    opacity: 0.7;
   }
 
   .menu-icon {